Magnetic resonance imaging (MRI) is a test that uses a magnetic field and pulses of radio wave energy to make pictures of organs and structures that are inside the body. During the MRI test (also called an MRI scan), you usually lie on your back on a table that is part of the MRI scanner. Your head, chest, and arms may be held with straps to help you stay still. The table will then slide into the space that contains the magnet.

Inside the scanner you will hear a fan and feel air moving. You may also hear tapping or snapping noises as the MRI scans are done. It is very important to stay completely still while the scan is being done.

An open MRI machine has a larger opening compared to a standard MRI machine. Some have magnets that do not completely surround your body, as shown here. But this kind of open MRI cannot do some types of MRI scans.

People who get nervous in small places (are claustrophobic) may feel better using an open MRI machine. An open MRI machine also may be easier to use for people who are very overweight or obese. But not all medical centers have this kind of MRI machine.

By

Healthwise Staff

Primary Medical Reviewer

Kathleen Romito, MD - Family Medicine

Specialist Medical Reviewer

Howard Schaff, MD - Diagnostic Radiology

Last Revised

May 16, 2011

eMedicineHealth Medical Reference from Healthwise

This information does not replace the advice of a doctor. Healthwise disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. How this information was developed to help you make better health decisions.